Glue the front panel on as shown

Gather these parts

Glue the rail in place as shown on the side with one slot

Glue the center rail in the central slot as shown on the side with three slot

Glue the detail plate slotted around the rail placed in the previous step

Flip the assembly over apply the other detail plate as shown

Glue rails down the front side as shown

Glue rails down the front side as shown

Gather these parts